package com.task.filter;

import com.alibaba.fastjson.JSON;
import com.task.common.BaseContext;
import com.task.common.R;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import java.io.IOException;

//检查用户是否已经完成登录
@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

//    路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

//        1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}", requestURI);
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/common/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login",

        };
//        2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

//        3、不需要处理，则直接放行
        if(check){
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }

//        4、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("employee"));

            Long empId =(Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            Long id = Thread.currentThread().getId();
            log.info("线程id为：{}", id);

            filterChain.doFilter(request, response);
            return;
        }
//        4、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("user"));

            Long userId =(Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            Long id = Thread.currentThread().getId();
            log.info("线程id为：{}", id);

            filterChain.doFilter(request, response);
            return;
        }
        log.info("用户未登录");
//        5、未登录则返回未登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }
    private boolean check(String[] urls, String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
